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=579 



TERTIARY FAUNA OF FLORIDA 



of the Antilles we have L. indigcna Dall (L. bisulcata Guppy, 1867, iiot of 

 Meek, 1861), L. clara Guppy, L. illecta Guppy, L. Packcri Forbes (+ incognita 

 Guppy), L. pcltclla Dall (pi. 32, fig. 5 ; = acnta Gabb, 1873, not Conr., 1832), 

 L. Giippvi Dall (CiTfi'inj'a led&formis Guppy), L. pcrlcpida Guppy, and an un- 

 described specie.s of Tindaria. There are several Darien species, probably 

 new, but as yet represented by material insufficient for full description. 



In addition to the species which persist from the Oligocene and the new 

 forms about to be described, the following are known from the North Ameri- 

 can Miocene : L. acittidcits and carinata H. C. Lea, L. concentrica Say (+ chorea 

 Conn, 1 846), L. liciata Conr., L. vitrca Orb. (+ Milleri Gabb), and the Cali- 

 fornian L. penita Conr. 



In the Pliocene there appear newly only L. inccnensis Gabb of Costa 

 Rica, and on the Pacific side L. pcruviana Dall (acnminata Nelson, 1870, not 

 von Buch, 1845) and /. taphria Dall (/.. c<clata Hinds, 1844, not Conr., 1832); 

 while from the Pleistocene of Maine we have L. Jacksoni Gould (1841, + 

 bticcaia (Stp.) Moller, 1842). 



The Ledas have been divided into a number of groups variously regarded 

 as sections, subgenera, or even genera. A synopsis of the principal ones may 

 be of use to students, and is here given before proceeding to describe the 

 species. I refer only to those represented in the Tertiary. 



Subfamily LEDINJE. 

 Genus LEDA Schumacher, sen so Into. 



A. I.cda Schum., saiso stricto, 1817. Type L. rostrata Mtg. 



Shell elongate, rostrate, with conspicuous concentric sculpture, slightly 

 gaping at the rostral end. 



B. Lcinlnilus (Risso cm.) Fischer, 1886. Type L. pclla (L.) = L. Rossiamis 



Risso. 



Shell shorter, with radial ribs on the rostrum, and oblique sculpture not 

 wholly coinciding with the incremental lines. Ex. L. cidata Conr. (not 

 Hinds), Eocene. 



C. Jnpitcria Bellardi, 1875. Type L. concava Bronn. 



Shell short, arcuate, inflated, sharply pointed behind the valves, not 

 gaping, sculpture concentric or faint, without radial ribbing, usually 

 small sized. 



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